01 a. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished fr…
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1.
Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.“The earth and each erratic world.” — Blackmore.
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2.
Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
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3.
Irregular; changeable.
Phrases & compounds
Erratic blocks, gravel, —
masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes.
Erratic phenomena —
the phenomena which relate to transported materials on the earth's surface.